来自陈雁翔的问题
【已知f(x)=(m+1)x^2+2mx+3为偶函数,则f(x)在区间(-4,2)上为A增函数,B减函数,C先增后减,D先减后增】
已知f(x)=(m+1)x^2+2mx+3为偶函数,则f(x)在区间(-4,2)上为
A增函数,B减函数,C先增后减,D先减后增
1回答
2020-04-11 23:17
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樊方芳
为偶函数,则奇次项系数为0,故m=0.因此f(x)=x^2+3
f(x)在(-4,2)上为先减,后增
选D.
2020-04-11 23:20:42
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